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【简答题】
25℃时，用F - 电极测定水中F - ，取25mL水样，加入10mL TISAB，到50mL测得电极电位为0.1370V；加入1.0×10 -3 mol/L标准溶液1.0mL后，测得电极电位为0.1170V。计算水样中含量。
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【单选题】______ travel round the world alone shows that he is full of courage.
A.
His deciding of
B.
He decides
C.
His decide
D.
His deciding to
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A.
has gone in
B.
has gone to
C.
has been in
D.
has been to
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A.
Coin -collector as
B.
As a coin –collector
C.
A coin- collector as
D.
Coin- collector that
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A.
worded about
B.
pleased with
C.
sorry for
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